Core box



March 10, 1931. J. B. LUKOM-SKI CORE BOX Filed NOV. 5, 1928 2 Sheets-Sheet 1 INVENTOR ATTORNEYS March 10, 1931.

J. B. LUKOMSKI GORE BOX Filed Nov. 5, 1928 2 Sheets-Sheet 2 va mw S ATTORNEYS Patented Mar. 10, 1931 I v UNITED STATES PATENT OFFICE JOHN B. LUKOMSKI, OI DETROIT, MICHIGAN GORE IBOX Application filed November 5, 1928.v Serial No. 317,196.

The present invention pertains to a novel is designed to form a core for a straight fitcore box for making the cores to be used in ting or pipe section. The body of the core casting tubular fittings. Such a core bo-X box is therefore straight and substantially cyis a substantially cylindrical body with closed lindrical and has end caps or closures so that ends, and the end closures are usually intethere will be formed a core box in the nagral with the body. Due to the fact that the ture of an enclosed receptacle as usual. Orends are closed, there is considerable difficuldinarily the end caps are integral with the ty in reaching the inner surfaces for the core body sections, but in the present invention a box for finishing or machining the same, and departure is made by providing the core box 10 the finishing operation is performed to a halves in the nature of tubular members 1 great extent by means of hand tools. with open ends 2. Due to the fact that the The object of the present invention is to ends are open, the sections may be clamped construct and assemble the core box in such a together in a suitable jig and finished intermanner that the inner surface of the body nally by a reamer or other suitable power 15 at least may be finished by a mechanically opdriven tool inserted through the ends. This erated tool. With this object in view, the means of finishing the interior of the body body is constructed as an open-ended memis a considerable saving over the means which ber so that a reamer or other suitable power would be resorted to if the ends were closed driven tool may be inserted through one end in the customary manner.

20 and thus utilized to finish the interior sur- After being machined in the manner deface. The sections of the box are now laid scribed, each of the sections 1 isfilled with a on a board, and a mold is built over the ends half core 3 of the size which would be made therof for the formation of the end portions thereby in the finished core box. The half by pouring metal therein. Preferably joincore and section are laid on a board 4, and

25 ing members are previously inserted in the sand molds 5 are built around the ends thereends of the open-ended body and become anof so that the cavity 6 contains the core ends chored in the metal which is cast over the and also the ends of the section 1. Previous ends. to formin the molds, joining members such The invention is fully disclosed by way of as screws are preferably driven partly into 30 example in the following description and in the ends of the section 1, so that when metal the accompanying drawing, in whichis poured into the molds, it will have the Figure 1 is a plan view of the core box in members partly embedded therein. The open condition; shape of the molds is such as to form the re- Fig. 2 is a longitudinal section of the core quisite end caps or closures, which, as al- 35 box in closed condition, showing in elevation ready indicated, will be positively united to an arbor therein; the ends of the section 1 by means of the Fig. 3 is an end view of the closed core box; members 7 Figure 7 illustrates one of the Fig. 4 is a section on the line 47-4: of sections 1 set up for the formation of caps at Fig. 2; both ends thereof. The remaining section 40 Fig. 5 is a plan view of one of the body secneed have only one cap cast thereon, and the tions; uncovered end will be closed by the means Fig. 6 is an end view thereof; and presently to be described. s

Fig. 7 is a longitudinal section showing the After the sections 1 have been capped, theyconstruction of the mold for casting the end are connected by means of hinges 8 and are closures on the ends of the body sections. fastened to the hinges by screws 9 which en- Reference to these views will now be made ter thickened portions 10 of the sections. The by use of like characters which are employed sections are located on the hinges in such a to designate corresponding parts throughmanner that when the latter are closed, the out. sections will fit accurately one over the other.

50 The core box illustrated in the drawings Prior to filling the sections with sand for the formation of a core, an arbor 11 is laid in the section which has a cap at only one end. A finger piece or tab 12 of the arbor extends through the open end While adjacent the tab is formed a semi-circular disk 13 which closes this end. The outer surface 14 of the disk is conical and is the counterpart of the surface which Will be formed on the core by the immediately adjacent cap 15 of the other section 1, as clearly illustrated in Figure 2. Thus, the disk 13' constitutes a half of one of the ends of the completed core.

Although a specific embodiment of the invention has been illustrated and described, it will be understood that various alterations in the details of construction may be made Without departing from the scope of the appended claim.

WVhat I claim is A core box comprising a pair of core sections, one of said sections having an open end, a cap at the other end of said section, an arbor receivable Within the first named section, and a disk formed on said arbor and adapted to close the open end of said section.

In testimony whereof I aflix my signature.

JOHN B. LUKOMSKI. 

